CN115672512A

CN115672512A - Flour milling system

Info

Publication number: CN115672512A
Application number: CN202211270973.8A
Authority: CN
Inventors: 李政利; 叶昱昕; 仰韻霖; 彭飞
Original assignee: Guangdong Kaijin New Energy Technology Co Ltd
Current assignee: Guangdong Kaijin New Energy Technology Co Ltd
Priority date: 2022-10-17
Filing date: 2022-10-17
Publication date: 2023-02-03

Abstract

The application discloses milling system, including loading attachment, mill device, grader, collection device, dust collector and fan and the control system who connects gradually, wherein the mill device includes the mill, the mill includes the mill motor, control system with loading attachment with mill motor communication is connected, control system is according to acquireing in real time the signal value of mill motor is transferred and is risen or is transferred and descend loading attachment material loading extremely the material loading speed of mill. This application can realize the automatically regulated of the continuous material loading of mill for the material volume that the mill is grinding can fluctuate from top to bottom around comparatively ideal material volume, remains throughout near comparatively ideal material volume, can reduce artificial participation moreover, is favorable to improving crocus unit interval output.

Description

Flour milling system

Technical Field

The application relates to the technical field of powder processing, especially, relate to crocus system.

Background

At present, a mill system is controlled by a relay and a conventional instrument, each motor is controlled by a manually operated start-stop button on a field control box, and analog quantities such as rotating speed, temperature, pressure and the like on the mill are displayed by the conventional instrument. An operator needs to observe the state of the motor and observe signals such as current, temperature, wind pressure and the like of the mill at any time, so that the labor intensity is high, and due to the influence of human factors, the product quality and the yield in unit time fluctuate greatly and the mill is difficult to be efficiently utilized.

Disclosure of Invention

The utility model provides a milling system can solve at least a technical problem in the background art.

For realizing above-mentioned purpose, the milling system that this application provided is including loading attachment, mill device, grader, collection device, dust collector and fan and the control system who connects gradually, wherein the mill device includes the mill, the mill includes the mill motor, control system with loading attachment with mill motor communication is connected, control system is according to obtaining in real time the signal value of mill motor is transferred and is risen or is transferred and descend the loading attachment material loading extremely the material loading speed of mill.

Optionally, the adjusting, by the control system, the feeding speed of the feeding device according to the signal value of the mill motor of the mill device acquired in real time includes:

the control system acquires the current value of the mill motor in real time and compares the current value acquired in real time with a set current value;

if the current value acquired in real time is smaller than the set current value, the control system controls the feeding device to increase the feeding speed;

and if the current value acquired in real time is larger than the set current value, the control system controls the feeding device to reduce the feeding speed.

Optionally, the feeding device comprises a first weighing device arranged on a feeding path of the feeding device, and the first weighing device is used for weighing the material to be processed;

the control system is in communication connection with the first weighing device, and acquires and accumulates the weighing capacity of the first weighing device.

Optionally, the collecting device comprises a second weighing device for collecting and weighing the finished products collected by the collecting device;

the control system is in communication connection with the second weighing device;

the control system accumulates the weight of the second weighing device and obtains a finished product ratio according to the ratio of the accumulated weight of the second weighing device to the accumulated weight of the first weighing device;

and/or

The powder grinding system also comprises a third weighing device, and the third weighing device is used for collecting and weighing unqualified products output by the discharging end of the dust removal device;

the control system is in communication connection with the third weighing device;

and the control system accumulates the weighing capacity of the third weighing device and obtains the ratio of unqualified products according to the ratio of the accumulated weighing capacity of the third weighing device to the accumulated weighing capacity of the first weighing device, or compares the accumulated weighing capacity of the third weighing device with the accumulated weighing capacity of the second weighing device with the accumulated weighing capacity of the first weighing device and determines whether the grinding system is abnormal according to the comparison result.

Optionally, the collecting device comprises a collecting body and a second weighing device, wherein the second weighing device is used for collecting and weighing the finished product output by the collecting body;

the control system is in communication connection with the second weighing device and the collection main body;

the control system acquires the real-time weight on the second weighing device and determines whether the real-time weight on the second weighing device reaches a preset weight value;

when the real-time weight on the second weighing device reaches the preset weight value, controlling the collecting main body to stop discharging;

and the control system controls the collecting main body to recover blanking according to the information that the package is changed.

Optionally, the milling system further comprises a third weighing device, and the third weighing device is used for collecting and weighing unqualified products output by the discharging end of the dust removal device;

the control system is in communication connection with the third weighing device and the dust removal device;

the control system acquires the real-time weight on the third weighing device and determines whether the real-time weight on the third weighing device reaches a preset weight value;

when the real-time weight on the third weighing device reaches the preset weight value, controlling the dust removal device to stop discharging;

and the control system controls the dust removal device to recover blanking according to the information that the package is replaced.

Optionally, the mill apparatus comprises a mill and a cooling system for cooling the mill;

the cooling system comprises an air cooling system, the air cooling system comprises an air cooler, an air outlet of the air cooler is connected with an air inlet of the mill, the air cooling system further comprises a first temperature detector used for detecting the temperature of outlet air, and the first temperature detector is in communication connection with the control system;

the control system obtains a first measured temperature value in real time through the first temperature detector;

the control system compares the first measured temperature value with a first preset temperature value and adjusts the outlet air temperature of the air cooler to be increased or decreased according to the comparison result;

and/or

The cooling system comprises a water cooling system, the water cooling system comprises a water cooling jacket arranged on the mill, a water inlet channel and a water outlet channel which are connected to the water cooling jacket, a water pump connected to the water inlet channel, and a cooling tower connected to the water outlet channel, the water pump is used for conveying cooling water of a water pool to the water cooling jacket and outputting the cooling water to the cooling tower through the water outlet channel, and the cooling tower is used for cooling the cooling water output by the water cooling jacket and outputting the cooling water to the water pool;

the water cooling system also comprises a second temperature detector which is arranged in the water outlet channel and used for detecting the temperature of the cooling water flowing out of the water cooling jacket to the water outlet channel;

the control system is in communication connection with the second temperature detector and the water pump;

the control system obtains a second measured temperature value in real time through the second temperature detector;

and the control system compares the second measured temperature value with a second preset temperature value and controls the water pump to increase or decrease the conveying speed according to the comparison result.

Optionally, the system further comprises an online particle sizer, wherein the online particle sizer is used for sampling and detecting particles sorted downstream by the classifier or finished products collected by the collecting device;

the motors of the online particle analyzer and the grader are in communication connection with the control system;

the online particle size analyzer compares the detected Dx detection value with a Dx target value, wherein Dx represents that the proportion of particles with the particle size smaller or larger than the Dx detection value is x%;

if the Dx detection value is smaller than the Dx target value, a corresponding control signal is sent to the control system, and the control system controls the motor of the grader to increase the frequency according to the control signal;

and if the Dx detection value is larger than the Dx target value, sending a corresponding control signal to the control system, and controlling the motor of the classifier to reduce the frequency by the control system according to the control signal.

Optionally, the collecting device includes a cyclone collector 41 and a transition bin communicated with a feed opening of the cyclone collector 41, the cyclone collector 41 is provided with a secondary air inlet, the secondary air inlet is provided with a secondary air inlet adjusting valve, and the proportion of fine powder in the finished product collected by the cyclone collector 41 can be changed by adjusting the opening degree of the secondary air inlet adjusting valve;

the powder grinding system also comprises an online particle sizer, wherein the online particle sizer is used for sampling and detecting finished products in the transition bin;

the secondary air inlet regulating valve and the online particle analyzer are in communication connection with the control system;

the online particle analyzer compares a detected Dy detection value with a Dy target value, wherein Dy represents the proportion of particles with the particle size smaller than or larger than the Dy value as y percent and is used for reflecting the particle size degree of finer particles in a finished product;

if the Dy detection value is smaller than the Dy target value, a corresponding control signal is sent to the control system, and the control system controls the secondary air inlet adjusting valve to increase the opening degree according to the control signal;

and if the Dy detection value is larger than the Dy target value, sending a corresponding control signal to the control system, and controlling the secondary air inlet regulating valve to reduce the opening degree by the control system according to the control signal.

Optionally, the online particle sizer compares the Dx detection value to a Dx target value, wherein Dx represents a percentage of particles having a particle size of less than or greater than x%;

Optionally, the dust removal device comprises a pulse bag dust remover, the pulse bag dust remover is provided with a differential pressure meter, and the differential pressure meter is in communication connection with the control system;

the differential pressure gauge is used for measuring the difference value between the internal pressure of the pulse bag-type dust collector and the pressure of an air outlet;

the control system determines whether the difference between the internal pressure and the air outlet pressure reaches or exceeds a preset differential pressure value;

and if the preset differential pressure value is reached or exceeded, generating prompt information.

Optionally, the system further comprises an anemoscope, wherein the anemoscope is arranged on a downstream pipeline of the dust removal device and used for measuring a wind flow value in real time, and the anemoscope is in communication connection with the control system;

the control system is used for comparing the wind flow value acquired in real time with a preset flow value;

if the air flow value acquired in real time is smaller than the preset flow value, controlling a motor of the fan to increase current;

and if the air flow value acquired in real time is larger than the preset flow value, controlling a motor of the fan to reduce the current.

Optionally, the dust removing device comprises a pulse bag dust remover;

the powder grinding system also comprises a dust concentration meter, the dust concentration meter is arranged on a downstream pipeline of the dust removal device and used for measuring the dust concentration value in real time, and the dust concentration meter is in communication connection with the control system;

the control system compares the dust concentration value obtained in real time with a preset concentration value;

and if the dust concentration value obtained in real time reaches or exceeds the preset concentration value, generating prompt information.

Optionally, the control system is a DCS control system, and includes an operation station and a PLC connected in communication;

the operation station is used for setting the operation parameters of the powder grinding system, remotely controlling the operation of the powder grinding system, dynamically displaying the state and related pictures of the powder grinding system, generating a report according to the operation data reported by the PLC, and storing and analyzing the historical production data of the powder grinding system;

and the PLC is used for controlling the operation of the powder grinding system according to the setting of the operation station and reporting operation data.

This application control system is connected with loading attachment and mill motor communication, control system according to the signal value of the mill motor that acquires in real time transfers the material loading speed of rising or transferring the material loading to the mill of material loading, and then can realize the automatically regulated of mill continuous feeding, make the material volume that the mill is grinding can fluctuate from top to bottom around comparatively ideal material volume, remain throughout near comparatively ideal material volume, can high-efficiently utilize the mill, and can reduce artificial participation, and then be favorable to improving crocus unit time output.

Drawings

Fig. 1 is a schematic view of a milling system according to an embodiment of the present disclosure.

Fig. 2 is an enlarged view of a portion a in fig. 1.

Fig. 3 is an enlarged view of a portion B in fig. 1.

Fig. 4 is an enlarged view of a portion C in fig. 1.

Fig. 5 is an enlarged view of a portion D in fig. 1.

FIG. 6 is a schematic block diagram of a control system according to an embodiment of the present application.

FIG. 7 is a schematic view of the connection relationship between the control system and the motor and the feeding device of the mill according to the embodiment of the present application.

FIG. 8 is a schematic block diagram of a control system for controlling the feeding speed of a feeding device according to information of a mill motor in the embodiment of the application.

FIG. 9 is a schematic view of the connection between the control system and the first weighing device according to the embodiment of the present application.

FIG. 10 is a schematic diagram of the connection relationship between the control system and the first weighing device and the second weighing device according to the embodiment of the present application.

FIG. 11 is a schematic view of the connection relationship between the control system and the first weighing device and the third weighing device according to the embodiment of the present application.

FIG. 12 is a schematic diagram of the connection relationship between the control system and the first weighing device, the second weighing device and the third weighing device according to the embodiment of the present application.

FIG. 13 is a schematic view of the connection of the control system to the second weighing device and the collection body according to the embodiment of the present application.

Fig. 14 is a schematic block diagram of the control system controlling the collecting body to stop blanking according to the information of the second weighing device to replace the package according to the embodiment of the present application.

FIG. 15 is a schematic view of the connection relationship between the control system and the third weighing device and the dust removing device according to the embodiment of the present application.

Fig. 16 is a schematic block diagram illustrating that the control system controls the dust removing device to stop discharging according to the information of the third weighing device to replace the package according to the embodiment of the application.

FIG. 17 is a schematic diagram of the connection of the control system to the first temperature detector and the air cooler according to an embodiment of the present application.

FIG. 18 is a schematic block diagram of a control system for controlling an air cooler based on information from a first temperature sensor according to an embodiment of the present application.

FIG. 19 is a schematic block diagram of a water cooling system according to an embodiment of the present application.

FIG. 20 is a schematic block diagram of a control system controlling a water pump according to information from a second temperature sensor according to an embodiment of the present application.

FIG. 21 is a schematic diagram of the connection between the control system and the motors of the on-line particle sizer and classifier according to the embodiment of the present application.

FIG. 22 is a schematic block diagram of a control system for controlling the motor adjustment frequency of a classifier according to online particle sizer information in an embodiment of the present application.

FIG. 23 is a schematic view of the connection relationship between the control system and the on-line particle analyzer and the secondary air regulating valve according to the embodiment of the present application.

FIG. 24 is a schematic block diagram of the control system according to the present application for controlling the adjustment of the opening degree of the secondary air regulating valve according to the information of the on-line particle analyzer.

FIG. 25 is a schematic view showing the connection relationship between the control system and the online particle analyzer, the secondary air inlet regulating valve and the motor of the classifier according to the embodiment of the present application.

FIG. 26 is a schematic block diagram of a control system for determining whether to generate a prompt based on differential pressure gauge information in accordance with an embodiment of the present application.

FIG. 27 is a schematic block diagram of a control system adjusting a motor current of a wind turbine based on anemometer information in accordance with an embodiment of the present application.

Fig. 28 is a schematic block diagram of the control system determining whether to generate the prompt message based on the dust concentration meter information according to the embodiment of the present application.

Detailed Description

In order to explain technical contents and structural features of the present application in detail, the following description is further made with reference to the embodiments and the accompanying drawings.

As shown in fig. 1-5, the present application discloses a milling system. This milling system includes loading attachment 1, mill device 2, grader 3, collection device 4, dust collector 5 and the fan 6 that connects gradually.

The feeding device 1 is used for conveying materials to be processed to a mill of the mill device 2 for processing. The mill device 2 is used for grinding the material to be processed input by the feeding device 1. The grader 3 is used for grading particles at the discharge end of the mill 21, fine particles are conveyed downstream through grading of the grader 3, and larger particles are blocked to return into the mill 21, so that the grading purpose is achieved. The collection device 4 collects the finished product from the particles output from the classifier 3. While the collecting device 4 collects the finished product, some of the finer particles enter the dust removing device 5, and the dust removing device 5 collects and outputs the particles entering the dust removing device. The fan 6 is used for forming a negative pressure environment in the passage between the classifier 3 and the fan 6 so that the particles automatically flow downstream.

Specifically, the pipelines 7 are connected between the discharge port of the classifier 3 and the feed port of the collecting device 4, between the upper outlet of the collecting device 4 and the dust removing device 5, and between the dust removing device 5 and the fan 6.

As shown in fig. 1 and 2, in some embodiments, the feeding device 1 comprises a dosing bin 11, two static dosing bins 121 and a belt conveyor 13. The feeding bin 11 is located above the static metering bins 121, the feed openings of the feeding bin 11 are respectively connected with the two static metering bins 121, the feed openings of the static metering bins 121 are arranged above the first ends of the conveyer belts 131 of the belt conveyors 13, and the second ends of the conveyer belts 131 are communicated with the corresponding chambers of the grinding machine 21 through the feed pipes 14. During operation, the two static metering bins 121 are alternately used, the material to be processed in the feeding bin 11 is alternately output to the two static metering bins 121, and after the static metering bins 121 are weighed, the material to be processed falls onto the conveying belt 131, and then flows backwards to the feeding pipe 14, and then flows into the corresponding cavity of the mill 21.

The accurate range of static measurement storehouse 121 can be in 1000KG error 0.1KG, can solve the problem of dynamic measurement error, is that the no substitutable accurate measurement of dynamic measurement is equipped. This application adopts static measurement storehouse 121 can realize that the feeding measures accurately.

The volume of the static dosing chamber 121 may be selected as desired, for example, 1m may be selected ³ Or other volume quantities.

Specifically, the feeding port of the feeding bin 11, the feeding port of the static metering bin 121, and the feeding pipe 14 are respectively provided with a feeding

valve

111, 1211, 141 (specifically, a particle anti-blocking feeding valve). The material to be processed in the feed bin 11 can be selectively output to different static metering bins 121 through a feed valve 111 at the feed opening of the feed bin 11. Through the blanking valve 1211 at the blanking port of the static metering bin 121, when the static metering bin 121 is weighed, the material to be processed can be output from the static metering bin 121 according to the requirement. The inflow of the material to be processed into the mill 21 can be controlled in time by means of a blanking valve 141 at the feed pipe 14. Above-mentioned baiting valve can be connected so that realize automatic control with milling system's 8 communication of control system, and specifically, control system 8 includes PLC 81 (programmable controller), and above-mentioned baiting valve is connected and is received PLC 81's control with PLC 81 communication.

Specifically, a material preparation mechanism 16 for loading the material to be processed may be suspended by using the electric hoist 15, and the electric hoist 15 is moved to a position corresponding to the feeding bin 11 to feed the material to be processed to the feeding bin 11.

Regarding the mill device 2, the material to be processed inputted from the feeding device 1 is ground by a mill 21, and the mill 21 is driven by a mill motor 211. The mill 21 is well known to those skilled in the art, and the specific structure and principle of the mill 21 is not important in this application, and may adopt a scheme known or not known at all by those skilled in the art, and thus will not be described in detail herein.

In some embodiments, the collecting device 4 comprises a cyclone collector 41, the cyclone collector 41 collects the finished product from the particles flowing into it, and some of the finer parts of the particles flowing from the classifier 3 into the cyclone collector 41 flow into the dust removing device 5. The cyclone collector 41 is a mechanism commonly used in the field of milling, and the specific structure and principle of the cyclone collector 41 are not important in this application, and may adopt a scheme known or not known at all by those skilled in the art, and thus will not be described herein again. In addition, the collecting device 4 is not limited to the manner of using the cyclone collector 41. The connection of the collecting device 4 to the classifier 3 and the dust removing device 5 may be a conventional one, but is not limited thereto, and the purpose of collecting the finished product and allowing some finer particles to flow into the dust removing device 5 may be achieved.

Specifically, the feed opening of the cyclone collector 41 is connected with a transition bin 42, and the finished product collected by the cyclone collector 41 flows into the transition bin 42. A blanking valve 425 (specifically, a star-shaped blanking valve) may be disposed at the blanking port of the transition bin 42, and the blanking of the transition bin 42 may be stopped or stopped by adjusting the blanking valve 425.

In some embodiments, the dust removing device 5 comprises a pulse bag dust collector 50, and the pulse bag dust collector 50 collects the particles entering the pulse bag dust collector and outputs the particles from the discharging end of the pulse bag dust collector.

Specifically, the pulse bag-type dust collector 50 comprises a dust collector main body 51, a conveying screw 52 is arranged at the lower end of the dust collector main body 51, the conveying screw 52 is connected with a blanking valve 53, and particles collected by the pulse bag-type dust collector 50 can be output by the blanking valve 53 under the action of the conveying screw 52. The conveying screw 52 can be controlled to start or stop conveying operation, and the pulse bag-type dust collector 50 can be controlled to discharge or stop discharging by adjusting the discharge valve 53.

The pulse bag dust collector 50 is a mechanism generally used in the field of grinding, and the specific structure and principle of the pulse bag dust collector 50 are not important in this application, and may adopt a scheme known or not known by those skilled in the art, so further description is not provided herein. In addition, the dust removing device 5 is not limited to the manner of using the pulse bag dust remover 50.

Referring to fig. 6, in order to facilitate the automatic control of the grinding system, partially or wholly, the grinding system of the present application further includes a control system 8.

Specifically, the control system 8 is a DCS control system, and includes an operation station 82 and a PLC 81 connected in communication. The operation station 82 is used for setting operation parameters of the powder grinding system, remotely controlling the operation of the powder grinding system, dynamically displaying the state and related pictures of the powder grinding system, generating a report according to operation data reported by the PLC 81, and storing and analyzing historical production data of the powder grinding system. The PLC 81 is used for controlling the operation of the powder grinding system according to the setting of the operation station 82 and reporting operation data.

Through DCS control system 8's setting, be favorable to carrying out holistic or local automatic control to the milling system. Can combine together field control and remote control, the remote configuration parameter of being convenient for and the demonstration operation condition can generate the report form and can store, the historical production data of analysis crocus system moreover based on operating data, and then can provide data support for the production of crocus system, is favorable to configuring more excellent operating parameter for crocus system. In addition, it is advantageous to quickly know the fault condition of the mill system based on the production data and event displays stored at the operator station 82.

Referring to fig. 1 to 3, 7 and 8, in some embodiments, the control system 8 is connected in communication with the feeding device 1 and the mill motor 211 of the mill device 2, and the control system 8 adjusts the feeding speed of the mill 21 of the feeding device 1 to the mill device 2 according to the signal value of the mill motor 211 acquired in real time.

In the present application, the signal value of the mill motor 211 represents the need of the mill 21 for milling, and the larger the signal value is, the more the material being milled is represented, and the smaller the signal value is, the less the material is represented. The control system 8 presets a set signal value for the mill motor 211 that indicates the desired condition of the mill 21 in which the mill 21 is grinding an appropriate amount of material. When the signal value obtained by the control system 8 in real time is greater than the set signal value, it indicates that the amount of the material being ground by the mill 21 is large (more than the above-mentioned appropriate amount of the material), so that the control system 8 can control the feeding device 1 to reduce the feeding speed, so that the speed of the material to be processed entering the mill 21 is reduced, and the amount of the material being ground by the mill 21 gradually decreases. When the signal value obtained by the control system 8 in real time is smaller than the set signal value, it indicates that the amount of the material being ground by the mill 21 is less (less than the appropriate amount of the material), so that the control system 8 can control the feeding device 1 to increase the feeding speed, so that the speed of the material to be processed entering the mill 21 is increased, and the amount of the material being ground by the mill 21 is gradually increased.

Through the technical means, the automatic adjustment of the continuous feeding of the mill 21 can be realized, so that the material quantity ground by the mill 21 can fluctuate up and down around the ideal material quantity, the material quantity is always kept near the ideal material quantity, the mill can be efficiently utilized, and the unit time (such as per hour) yield of milled powder is favorably improved.

The yield of the milled powder per unit time can be increased by 15 to 18 percent through field tests.

Specifically, the signal value is a current value of the mill motor 211.

The control system 8 adjusts the feeding speed of the feeding device 1 up or down according to the signal value of the mill motor 211 acquired in real time, and comprises the following steps:

the control system 8 acquires the current value of the mill motor 211 in real time and compares the current value acquired in real time with a set current value;

if the current value acquired in real time is smaller than the set current value, the control system 8 controls the feeding device 1 to increase the feeding speed;

and if the current value acquired in real time is larger than the set current value, the control system 8 controls the feeding device 1 to reduce the feeding speed.

More specifically, the feeding device 1 comprises a belt conveyor 13, the belt conveyor 13 is used for feeding the material to be processed into a grinding machine 21;

if the current value acquired in real time is smaller than the set current value, the control system 8 controls the belt conveyor 13 to increase the conveying speed;

if the current value obtained in real time is larger than the set current value, the control system 8 controls the belt conveyor 13 to reduce the conveying speed.

The belt conveyor 13 includes a driver 132 and a conveyor belt 131, and the control system 8 raises or lowers the conveying speed of the conveyor belt 131 by controlling the driver 132.

Further, one end of the conveyor belt 131 close to the mill 21 communicates with a corresponding chamber of the mill 21 through the feed pipe 14 to convey the material to be processed into the mill 21. A blanking valve 141 may be provided at the feed pipe 14 to control blanking of the material to be processed.

When the conveying speed of the conveyor belt 131 changes, the feeding speed to the conveyor belt 131 can be adjusted as necessary. According to the previous embodiment, the feeding speed of the two static measuring bins 121 is increased.

Referring to fig. 1 and 9 to 12, in some embodiments, the feeding device 1 includes a first weighing device 12 disposed on a feeding path of the feeding device, wherein the first weighing device 12 is used for weighing a material to be processed; the control system 8 is in communication connection with the first weighing device 12, and the control system 8 acquires and accumulates the weighing capacity of the first weighing device 12.

The first weighing device 12 is arranged on the feeding path to weigh the material to be processed, and the control system 8 can acquire and accumulate the weighing amount from the first weighing device 12, so that the total feeding amount of the staged processing can be acquired, and a related evaluation result and the like can be conveniently acquired according to the total product amount and/or the total unqualified product amount acquired after the processing.

Specifically, the first weighing device 12 includes a static measuring bin 121, a feeding bin 11 is disposed above the static measuring bin 121, and the feeding bin 11 feeds materials into the static measuring bin 121. The accurate range of static measurement storehouse 121 error 0.1KG in 1000KG can solve the problem of dynamic measurement error, is that the no substitutable accurate measurement of dynamic measurement is equipped. This application adopts static measurement storehouse 121 can realize that the feeding measures accurately, gives technological parameter and can control mill 21 better, reduces the over-grinding, is favorable to the maximize feed, realizes efficiency maximize.

More specifically, the first weighing device 12 comprises two static dosing bins 121. During operation, the two static measuring bins 121 are alternately used, the material to be processed in the feeding bin 11 is alternately output to the two static measuring bins 121, and after the static measuring bins 121 are weighed, the material to be processed is discharged from the static measuring bins 121 and is conveyed backwards. The control system 8 is in communication with the two static weighing bins 121 respectively to obtain the weighing amounts of the two static weighing bins 121, and can perform accumulation to obtain the total feeding amount.

As an alternative embodiment, the collecting device 4 comprises second weighing means 43, the second weighing means 43 being adapted to collect and weigh the finished products collected by the collecting device 4; the control system 8 is in communication connection with the second weighing device 43; the control system 8 integrates the weight of the second weighing device 43 and obtains the finished product ratio according to the ratio of the integrated weight of the second weighing device 43 to the integrated weight of the first weighing device 12, thereby being beneficial to evaluating and analyzing the milling system through the finished product ratio.

In particular, the second weighing device 43 is a weighbridge, arranged below the collecting body of the collecting device 4. The 1000KG internal error of weighbridge that this application adopted 0.1KG, can carry out accurate weighing.

As an optional embodiment, the milling system further comprises a third weighing device 55, and the third weighing device 55 is used for collecting and weighing the unqualified products (finer particles) output by the discharging end of the dust removing device 5; the control system 8 is in communication connection with the third weighing device 55; the control system 8 accumulates the weight of the third weighing device 55 and obtains the ratio of the unqualified products according to the ratio of the accumulated weight of the third weighing device 55 to the accumulated weight of the first weighing device 12, thereby being beneficial to evaluating and analyzing the milling system through the ratio of the unqualified products.

Specifically, the third weighing device 55 is a weighbridge scale, and is disposed below the dust removing device 5. Error 0.1KG in the weigh-bridge 1000KG that this application adopted can carry out accurate weighing.

As an optional implementation manner, the second weighing device 43 and the third weighing device 55 may be included at the same time, so that the accumulated finished product amount and the accumulated rejected product amount may be obtained at the same time, and it is convenient to evaluate and analyze the milling system according to the accumulated finished product amount, the accumulated rejected product amount and the accumulated feeding amount, and it is more beneficial to determine whether the milling system is abnormal.

Referring to fig. 1, 4, 13 and 14, in some embodiments, the collecting device 4 includes a collecting body 40 and a second weighing device 43, wherein the second weighing device 43 is used for collecting and weighing the finished product output by the collecting body 40; the control system 8 is in communication with the second weighing device 43 and the collecting body 40; the control system 8 obtains the real-time weight on the second weighing device 43 and determines whether the real-time weight on the second weighing device 43 reaches a preset weight value; when the real-time weight on the second weighing device 43 reaches a preset weight value, controlling the collection main body 40 to stop blanking and prompting to replace the package (possibly prompting in various ways such as display); the control system 8 controls the collecting body 40 to resume the blanking according to the information that the package has been replaced. Through above-mentioned technical means, this application can automatic control collect main part 40 and stop the unloading in order to change the packing after the packing is full (set for the standard), and after accomplishing the packing change, control system 8 can collect main part 40 restart unloading according to the information control that the packing has changed moreover, and then is favorable to the intellectuality of finished product collection.

It should be noted that the "real-time weight" may be the measured total weight of the second weighing device 43, but is not limited thereto, and may be the measured total weight excluding the weight after packaging. In addition, when real-time weight on second weighing device 43 reaches preset weight value, need not indicate to change the packing, for example, milling system can additionally dispose the equipment of automatic change packing, and this equipment can be connected with 8 communication of control system, and when real-time weight on second weighing device 43 reaches preset weight value, control system 8 can control this equipment and change packing etc..

Specifically, the second weighing device 43 is a weighbridge scale, and is disposed below the dust removing device 5. Error 0.1KG in the weigh-bridge 1000KG that this application adopted can carry out accurate weighing.

In particular, the information that the package has been replaced may be the measured weight matched to the package weight fed back to the control system 8 by the second weighing device 43, and when the measured weight is equal to the preset package weight value, it may be considered that a new package has been placed on the second weighing device 43, and the replacement is completed, at which point the collecting body 40 may be controlled to restart the blanking. In order to ensure that the measured weight is the weight value obtained by placing the package on the second weighing device 43, the measured weight may be compared with a preset package weight value after the measured weight is continuously obtained for a short period of time, so as to prevent erroneous determination. Of course, the information that the package has been replaced is not limited to the above implementation.

Specifically, the collection body 40 includes a discharge valve 425, and the control system 8 is in communication with the discharge valve 425; when the real-time weight on the second weighing device 43 reaches a preset weight value, the blanking valve 425 is controlled to stop blanking and the package replacement is prompted; the control system 8 controls the blanking valve 425 to resume blanking based on the information that the package has been replaced.

Further, the collecting body 40 includes a cyclone collector 41 and a transition bin 42 connected to a feeding port of the cyclone collector 41, and a feeding valve 425 is disposed at the feeding port of the transition bin 42. Of course, the collecting body 40 is not limited to this form.

Referring to fig. 1, 15 and 16, in some embodiments, the milling system further includes a third weighing device 55, and the third weighing device 55 is used for collecting and weighing the unqualified products output from the discharging end of the dust removing device 5; the control system 8 is in communication connection with the third weighing device 55 and the dust removal device 5; the control system 8 obtains the real-time weight on the third weighing device 55 and determines whether the real-time weight on the third weighing device 55 reaches a preset weight value; when the real-time weight on the third weighing device 55 reaches a preset weight value, controlling the dust removal device 5 to stop discharging and prompting to replace the package; and the control system 8 controls the dust removal device 5 to recover the blanking according to the information that the package is replaced. Through the technical means, this application can automatic control dust collector 5 stop the unloading in order to change the packing after the packing is filled with (sets for the standard), and after accomplishing the packing and changing, control system 8 can be according to the information control dust collector 5 unloading that the packing has been changed again, and then is favorable to changing the intellectuality of packing.

It should be noted that the "real-time weight" may be the measured total weight of the second weighing device 43, but is not limited thereto, and may be the measured total weight excluding the weight after packaging. In addition, when real-time weight on third weighing device 55 reaches preset weight value, need not indicate to change the packing, for example, the crocus system can additionally dispose the equipment of automatic change packing, and this equipment can be connected with the communication of control system 8, and when real-time weight on third weighing device 55 reaches preset weight value, control system 8 can control this equipment and change packing etc..

Specifically, the information that the package has been replaced may be an actual measurement weight matched with the package weight that is fed back to the control system 8 by the third weighing device 55, and when the actual measurement weight is equivalent to the preset package weight, it may be considered that a new package has been placed on the third weighing device 55, the replacement is completed, and at this time, the dust removing device 5 may be controlled to restart the blanking. In order to ensure that the measured weight is the weight value obtained by placing the package on the third weighing device 55, the measured weight may be compared with a preset package weight value after the measured weight is continuously obtained for a short period of time, so as to prevent erroneous determination. Of course, the information that the package has been replaced is not limited to the above implementation.

Specifically, the dust removing device 5 comprises a pulse bag dust remover 50, the pulse bag dust remover 50 comprises a dust remover main body 51, a conveying screw 52 is arranged at the lower end of the dust remover main body 51, the conveying screw 52 is connected with a blanking valve 53, and under the action of the conveying screw 52, particles collected by the pulse bag dust remover 50 can be output by the blanking valve 53. The control system 8 is respectively in communication connection with the conveying screw 52 and the blanking valve 53; when the real-time weight on the third weighing device 55 reaches a preset weight value, the control system 8 controls the conveying screw 52 to stop working, controls the blanking valve 53 to stop blanking and prompts to replace the package; the control system 8 controls the conveying screw 52 to work again and controls the blanking valve 53 to blank again according to the information that the package is changed. Of course, the dust removing device 5 is not limited to the above form.

In order to achieve a better grinding effect, the mill device 2 comprises a mill 21 and a cooling system for cooling the mill 21.

Referring to fig. 1, fig. 3, fig. 17 and fig. 18, in some embodiments, the cooling system includes an air cooling system 22, the air cooling system 22 includes an air cooler 221, an air outlet of the air cooler 221 is connected to an air inlet of the mill 21, the air cooling system 22 further includes a first temperature detector 222 for detecting an air outlet temperature, and the first temperature detector 222 is connected to the control system 8 in a communication manner; the control system 8 obtains a first measured temperature value in real time through the first temperature detector 222; the control system 8 compares the first measured temperature value with a first preset temperature value and adjusts the outlet air temperature of the cooling fan 221 according to the comparison result.

Specifically, when the first measured temperature value is greater than the first preset temperature value, the control system 8 controls the air cooler 221 to lower the outlet air temperature. When the second measured temperature value is smaller than the second preset temperature value, the control system 8 controls the air cooler 221 to increase the air outlet temperature.

The air cooler 221 can introduce cold air with a temperature lower than 10 ℃ into the mill 21, even cold air with a temperature lower than 5 ℃, so that the heat generated by collision of the heat-sensitive high polymer material can be reduced, and the occurrence of the phenomena of conglomeration and self-adhesion of petroleum coke, asphalt and the like can be reduced. And the first actually measured temperature value is compared with the first preset temperature value, so that the control of the outlet air temperature of the air cooler 221 within a proper temperature range is facilitated.

Specifically, in order to facilitate accurate detection, the first temperature detector 222 is disposed at the air outlet of the air cooler 221. But is not limited thereto.

Referring to fig. 1, 3, 19 and 20, in some embodiments, the cooling system includes a water cooling system 23, the water cooling system 23 includes a water cooling jacket 231 disposed on the mill 21, a water inlet channel 232 and a water outlet channel 233 connected to the water cooling jacket 231, a water pump 234 connected to the water inlet channel 232, and a cooling tower 235 connected to the water outlet channel 233, the water pump 234 is configured to deliver cooling water from a water pool 236 to the water cooling jacket 231 and output the cooling water from the water outlet channel 233 to the cooling tower 235, and the cooling tower 235 is configured to cool the cooling water output from the water cooling jacket 231 and output the cooling water to the water pool 236. The water cooling system 23 further includes a second temperature detector 237 (specifically, a temperature transmitter), where the second temperature detector 237 is disposed in the water outlet channel 233 and is configured to detect a temperature of the cooling water flowing out of the water cooling jacket 231 to the water outlet channel 233; the control system 8 is in communication with the second temperature detector 237 and the water pump 234; the control system 8 obtains a second measured temperature value in real time through the second temperature detector 237; the control system 8 compares the second measured temperature value with a second preset temperature value and controls the water pump 234 to increase or decrease the conveying speed according to the comparison result.

Specifically, when the second measured temperature value is greater than the second preset temperature value, the control system 8 controls the water pump 234 to increase the conveying speed, so as to increase the circulation speed of the cooling water. When the second measured temperature value is smaller than the second preset temperature value, the control system 8 controls the water pump 234 to reduce the conveying speed, and then reduces and increases the circulation speed of the cooling water.

The residence time in mill 21 is very short due to the relatively fast air cooling rate. Can take away partial material surface's heat energy, nevertheless to the heat that mill 21 self produced, through the setting of above-mentioned water cooling system 23, can utilize the cooling water to carry out circulative cooling to mill 21, can realize better cooling effect to let mill 21 keep at low temperature or normal atmospheric temperature state all the time. And through comparing second actual measurement temperature value with second preset temperature value, be favorable to setting up the circulating speed of cooling water according to the needs of mill 21, and then be favorable to reaching better cooling effect.

Referring to fig. 1, 21 and 22, in some embodiments, the milling system further includes an on-line particle size analyzer 9, and the on-line particle size analyzer 9 is used for sampling and detecting the particles sorted downstream by the classifier 3 or the finished products collected by the collecting device 4, so as to facilitate the relevant control according to the on-line detected particle size.

The online particle analyzer 9 and a motor 31 of the classifier 3 are in communication connection with the control system 8; the online particle size analyzer 9 compares the Dx detection value with a Dx target value, wherein Dx represents that the proportion of particles with the particle size smaller or larger than that is x%; if the Dx detection value is smaller than the Dx target value, a corresponding control signal is sent to the control system 8, and the control system 8 controls the motor 31 of the classifier 3 to increase the frequency according to the control signal; if the Dx detection value is larger than the Dx target value, a corresponding control signal is sent to the control system 8, and the control system 8 controls the motor 31 of the classifier 3 to reduce the frequency according to the control signal.

Because online particle analyzer 9 can carry out sampling test on line, and when the Dx detected value is less than the Dx target value and is greater than the Dx target value, all can send control signal to control system 8, and then control system 8 can increase the frequency or reduce the frequency based on control signal control grader 3's motor 31 for the Dx of the finished product that grader 3 selected to the granule of low reaches or collection device 4 collection obtains promoting or reducing, so that obtain the product that the granularity value accords with the requirement all the time.

Specifically, dx is the D50 value, representing the average particle size detected by the sampling. But is not limited thereto.

Specifically, when the Dx detection value is smaller than the Dx target value, the control signal is an increased output current (analog quantity). When the Dx detection value is larger than the Dx target value, the control signal is a reduced output current (analog quantity).

Specifically, the collecting device 4 includes a cyclone collector 41 and a transition bin 42 communicated with a feed opening of the cyclone collector 41, and the online particle analyzer 9 is used for sampling and detecting the finished product in the transition bin 42, so as to directly detect the finished product.

Specifically, the frequency of the motor 31 of the classifier 3 is adjusted based on the comparison result of the Dx detection values, and the air volume of the fan 6 is also adjusted so as to satisfy the distribution of the particle diameter target.

In other embodiments, the online particle sizer 9 can also sample from the conduit 7 between the classifier 3 and the collection device 4.

Specifically, the sampled material is fed back after the online particle analyzer 9 completes the detection.

Referring to fig. 1, 4 and 23 to 25, in some embodiments, the collecting device 4 includes a cyclone collector 41 and a transition bin 42 communicated with a discharge opening of the cyclone collector 41, the cyclone collector 41 is provided with a secondary air inlet 411, the secondary air inlet 411 is provided with a secondary air inlet adjusting valve 412, and the proportion of the finer particles with the size smaller than a specific value in the finished product collected by the cyclone collector 41 can be changed by adjusting the opening degree of the secondary air inlet adjusting valve 412.

The milling system also comprises an online particle sizer 9, and the online particle sizer 9 is used for sampling and detecting finished products in the transition bin 42; the secondary air inlet adjusting valve 412 and the online particle analyzer 9 are in communication connection with the control system 8.

The online particle analyzer 9 compares the Dy detection value with a Dy target value; if the Dy detection value is smaller than the Dy target value, a corresponding control signal is sent to the control system 8, and the control system 8 controls the secondary air inlet regulating valve 412 to increase the opening degree according to the control signal; if the Dy detection value is larger than the Dy target value, a corresponding control signal is sent to the control system 8, and the control system 8 controls the secondary air inlet adjusting valve 412 to reduce the opening degree according to the control signal.

Wherein Dy represents the proportion of particles with the particle diameter smaller or larger than Dy is y percent and is used for reflecting the particle size degree of finer particles in a finished product.

Specifically, dx may be D10, meaning that the proportion of particles having a particle diameter smaller than that is 10%. Depending on the on-line sizer 9 setting, dx can be D90, meaning that the fraction of particles with a particle size greater than that is 90%. Of course, the value of Dx is not limited thereto.

Because online particle size analyzer 9 can carry out sample test to the finished product in transition bin 42 on-line, and when the Dy detected value is less than the Dy target value and is greater than the Dy target value, all can send control signal to control system 8, and then control system 8 can increase the aperture or reduce the aperture based on control signal control secondary air inlet governing valve 412, make the finer particle volume that gets into dust collector 5 increase or reduce, the finished product Dy that cyclone collector 41 collected can be promoted or reduce, and then obtain the appropriate finished product of finer particle content, be favorable to satisfying the even requirement of granularity of high-end graphite negative pole petroleum coke etc..

Specifically, when the Dy detection value is smaller than the Dy target value, the control signal is an increased output current (analog quantity). When the Dy detection value is larger than the Dy target value, the control signal is a reduced output current (analog quantity).

Specifically, the sampled material is fed back to the transition bin 42 after the on-line particle sizer 9 completes the inspection.

When Dy is detected in the above manner, the on-line grain analyzer 9 simultaneously sends a control signal to the control system 8 based on a comparison between the obtained Dx detection value and the Dx target value, and the control system 8 controls the motor 31 of the classifier 3 to increase or decrease the frequency accordingly. And then both Dx and Dy of the obtained finished product meet the requirements.

In the above embodiment, the use of the online particle analyzer 9 can also avoid the interference of human factors such as manual sampling and detection, and is beneficial to reducing the labor cost.

Referring to fig. 1 and 26, in some embodiments, the dust removing device 5 includes a pulse bag dust remover 50, the pulse bag dust remover 50 is installed with a differential pressure gauge P, and the differential pressure gauge P is in communication connection with the control system 8; the differential pressure gauge P is used for measuring the difference value between the internal pressure of the pulse bag-type dust collector 50 and the pressure at the air outlet; the control system 8 determines whether the difference between the internal pressure and the outlet pressure reaches or exceeds a preset differential pressure value; and if the pressure difference value reaches or exceeds the preset pressure difference value, generating prompt information.

When the difference between the internal pressure and the air outlet pressure reaches or exceeds the preset differential pressure value, it is indicated that the cloth bag of the pulse bag dust collector 50 is blocked, and the cloth bag needs to be checked and/or replaced at the moment, so that the control system 8 can generate prompt information so that related personnel can know the condition conveniently.

When the difference value between the internal pressure and the air outlet pressure does not reach the preset differential pressure value, the normal state can be displayed.

Specifically, the content of the prompt message may be set as needed, and may include a verbal prompt that the cloth bag is blocked, a cloth bag needs to be checked and/or replaced, or only include a result of data comparison, and so on, as long as the relevant person can accurately know the information.

In the case that the control system 8 includes the operation station 82 and the PLC 81, the prompt message may be displayed on the operation station 82, or a voice prompt may be sent, or a message may be pushed, etc.

Referring to fig. 5 and 27, in some embodiments, the pulverizer system further includes an anemometer W disposed in the downstream pipe 7 of the dust collector 5 (specifically, near the fan 6) for measuring the wind flow rate in real time, and the anemometer W is in communication with the control system 8. The control system 8 is used for comparing the wind flow value acquired in real time with a preset flow value; if the real-time acquired air flow value is smaller than the preset flow value, the air flow of the specification is smaller, and the motor 61 of the fan 6 is controlled to increase the current; if the real-time acquired air flow value is greater than the preset flow value, it indicates that the air flow value is large, and the motor 61 of the fan 6 is controlled to reduce the current. By the technical means, automatic control can be realized, and the actual air flow value is always maintained in a proper range.

Referring to fig. 5 and 28, in some embodiments, the dust removing device 5 includes a pulse bag dust remover 50. The milling system also comprises a dust concentration meter Y, the dust concentration meter Y is arranged on a downstream pipeline 7 of the dust removal device 5 (specifically arranged on the downstream of the fan 6 so as to be convenient for arrangement) and used for measuring the dust concentration value in real time, and the dust concentration meter Y is in communication connection with the control system 8. The control system 8 compares the dust concentration value obtained in real time with a preset concentration value; and if the dust concentration value obtained in real time reaches or exceeds a preset concentration value, indicating that the cloth bag is damaged at a high probability, generating prompt information. If the dust concentration value acquired in real time does not reach the preset concentration value, the normal state can be displayed.

Through setting up the dust concentration meter Y who is connected with 8 communications of control system, control system 8 can compare the dust concentration value that acquires in real time with predetermineeing the concentration value and generate tip information when the dust concentration value that acquires in real time reaches or surpasses and predetermine the concentration value to can in time remind relevant personnel to detect or change sack etc. ensure simultaneously that emission concentration is ultralow standard (less than or equal to 15 mg/m) all the time ³ ) And (5) discharging.

Specifically, a silencer Z is provided on the downstream side of the fan 6, and a dust concentration meter Y is provided at the outlet end of the silencer Z.

In the case where control system 8 includes operator station 82 and PLC 81, the prompt message may be displayed on operator station 82, a voice prompt may be issued, or a push of the message may be performed, etc.

In the above embodiment, the control system 8 can simultaneously and the above-mentioned all the component parts that have communication connection with it all communication connection and control according to the above-mentioned mode, and then be favorable to the automation and the remote control of crocus system, can greatly reduce human resource cost, improve the yield and the output per unit time of crocus, make equipment operate more steadily and reliably, improve the dust collection ability simultaneously, reduce the harm of dust to producers, improve the overall environment in workshop.

It should be noted that, the application does not limit the types of materials that can be processed by the milling system, and is suitable for powder materials with a certain size distribution range of particle size and special requirements on coarse and fine powder content.

The above disclosure is only a preferred embodiment of the present application, and the scope of the present application is not limited thereto, so that the equivalent changes made in the claims of the present application are all covered by the present application.

Claims

1. Milling system, its characterized in that: including loading attachment, mill device, grader, collection device, dust collector and fan and the control system who connects gradually, wherein the mill device includes the mill, the mill includes the mill motor, control system with loading attachment with mill motor communication is connected, control system is according to acquireing in real time the signal value of mill motor is transferred and is risen or is transferred and descend loading attachment material loading extremely the material loading speed of mill.

2. The milling system of claim 1,

the control system adjusts the feeding speed of the feeding device according to the signal value of the mill motor of the mill device acquired in real time comprises the following steps:

3. The milling system of claim 1,

the feeding device comprises a first weighing device arranged on a feeding path of the feeding device, and the first weighing device is used for weighing the material to be processed;

4. The milling system of claim 3,

the collecting device comprises a second weighing device, and the second weighing device is used for collecting and weighing the finished products collected by the collecting device;

and/or

and the control system accumulates the weight of the third weighing device and obtains the ratio of unqualified products according to the ratio of the accumulated weight of the third weighing device to the accumulated weight of the first weighing device, or compares the accumulated weight of the third weighing device with the accumulated weight of the second weighing device with the accumulated weight of the first weighing device and determines whether the grinding system is abnormal according to the comparison result.

5. The milling system of claim 1,

the collecting device comprises a collecting main body and a second weighing device, and the second weighing device is used for collecting and weighing finished products output by the collecting main body;

the control system is in communication connection with the second weighing device and the collecting main body;

when the real-time weight on the second weighing device reaches the preset weight value, controlling the collection main body to stop discharging;

and the control system controls the collection main body to recover blanking according to the information that the package is replaced.

6. The milling system of claim 1,

7. The milling system of claim 1,

the mill device comprises a mill and a cooling system for cooling the mill;

the control system acquires a first measured temperature value in real time through the first temperature detector;

the control system compares the first actually-measured temperature value with a first preset temperature value and adjusts the outlet air temperature of the air cooler to be increased or decreased according to the comparison result;

and/or

8. The milling system of claim 1,

the online particle sizer is used for sampling and detecting particles sorted to the downstream by the classifier or finished products collected by the collecting device;

the motors of the online particle size analyzer and the grader are in communication connection with the control system;

the online particle size analyzer compares a detected Dx detection value with a Dx target value, wherein Dx represents that the proportion of particles with the particle size smaller or larger than the Dx is x%;

if the Dx detection value is smaller than the Dx target value, a corresponding control signal is sent to the control system, and the control system controls the motor of the classifier to increase the frequency according to the control signal;

9. The milling system of claim 1,

the collecting device comprises a cyclone collector 41 and a transition bin communicated with a feed opening of the cyclone collector 41, the cyclone collector 41 is provided with a secondary air inlet, the secondary air inlet is provided with a secondary air inlet adjusting valve, and the proportion of fine powder in a finished product collected by the cyclone collector 41 can be changed by adjusting the opening of the secondary air inlet adjusting valve;

the milling system also comprises an online particle size analyzer, and the online particle size analyzer is used for sampling and detecting finished products in the transition bin;

10. The milling system of claim 9,

the online particle size analyzer compares a Dx detection value with a Dx target value, wherein Dx represents that the proportion of particles with the particle size smaller or larger than the Dx detection value is x%;

11. The milling system of claim 1,

the dust removal device comprises a pulse bag-type dust remover, the pulse bag-type dust remover is provided with a differential pressure meter, and the differential pressure meter is in communication connection with the control system;

the control system determines whether the difference between the internal pressure and the air outlet pressure reaches or exceeds a preset pressure difference value;

12. The milling system of claim 1,

the wind speed meter is arranged on a downstream pipeline of the dust removal device and used for measuring a wind flow value in real time, and the wind speed meter is in communication connection with the control system;

if the wind flow value acquired in real time is smaller than the preset flow value, controlling a motor of the fan to increase current;

13. The milling system of claim 1,

the dust removal device comprises a pulse bag dust remover;

14. The milling system of claim 1,

the control system is a DCS control system and comprises an operation station and a PLC which are in communication connection;